Oh, I see. But I already beat them all before entering Hyrule Castle, so I'd have to start a new game to see it. I was just not aware the endboss fight varied much more than just lowering the HP of Ganon through the rays.That's how it work. Any unbeaten divine beast remaining will be part of the final battle. That's the point of the whole design with.the rays pointing at the castle
And by the way, there's no "too early" point after the plateau. Do things whenever you feel like it.